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* A particularly [[TearJerker heartbreaking]] [[TheReveal revelation]] of a mole occurs in episode 17 of ''{{Mai-Otome}}''...
** ...and likewise in episode 8 of ''{{Simoun}}''.
* Miyu, and later Alyssa from ''{{Mai-HiME}}''. The former is a RobotGirl equipped and programmed to destroy [=CHILD=]s with one strike, and the latter is an ArtificialHuman and a "fake [=HiME=]" designed to [[LaserGuidedTykebomb find and subdue the real ones]].
* BigBad Dr. Hell from ''Anime/MazingerZ'' had moles installed in several countries, usually infiltrated into centers of scientific research but also in army bases. The most infamous were [[spoiler:Rico,]] an android Dr. Smith -a New Yorker scientist- had hired as his assistant and who later infiltrated the [[HomeBase Photon Atomic Power Research Institute]] to sabotage the [[MidSeasonUpgrade Jet]] [[RazorWings Scrander]], [[spoiler:Erika]], a female android who was supposed to infiltrate the Institute, but got amnesiac and befriended Kouji, and several androids impersonated different characters in order to wreak havoc [[spoiler:(such like Professor Yumi, Dr. Smith or Kouji and Shiro's mother)]].
** ''[[Anime/GreatMazinger The Mykene Empire]]'' also had a mole infiltrated among Dr. Hell's henchmen, [[spoiler:Archduke Gorgon]], and Marquiss Janus tried to infiltrate into the Fortress of Science once by pretending being an average human girl.
** And in ''ShinMazingerZero'' Dr. Hell created a mole believing she would work for him, but in reality she was a ReverseMole, always on the heroes' side, and was only biding her time before defecting the first chance she got: [[spoiler:Minerva-X]].
* Sara in ''SoukouNoStrain'' is always expected to be The Mole, especially when she swoops in to save the day in episode 4 and ''especially'' when her [[LukeIAmYourFather relationship to Ralph]] is revealed; no wonder she tried to cover it up with a new identity (but that just made it worse).
* Technically, Light Yagami becomes a kind of mole in ''Manga/DeathNote'' when [[spoiler:L gets him onto the team]] and again when [[spoiler:L dies, and the others get him to lead the detectives.]]
** Misa is also frequently a mole, sometimes several layers deep.
* In ''Anime/CorrectorYui'', once [[spoiler:Haruna joins the team, it isn't long before she starts using her mind-control voice (which only Yui, as a human, can resist) to make the others pick each other off. Haruna herself doesn't know it and then she turns out to be BrainwashedAndCrazy (she's even turned into a DarkMagicalGirl), but the guy controlling her actually made it subtle.]]
* You Takami spies on Ganta in ''DeadmanWonderland'' in exchange for [[spoiler:the over 90 million "cast points" (DW money) he saved up to buy his sister's freedom]]. Ironically, not only does [[spoiler:Ganta figures out You's just using him and doesn't care]] but [[spoiler:his sister really ''does'' deserve to be imprisoned]].
* Kaji from Anime/NeonGenesisEvangelion is secretly investigating NERV's inner workings and secrets on behalf of SEELE and the UN. He's also the mole in SEELE, feeding information and the embryonic Adam to Gendo Ikari behind SEELE's back.
* The biggest surprise of ''{{Trigun}}'' was [[spoiler: Wolfwood]]'s identity as a mole, but he manages to turn this into a HeelFaceTurn through Vash's influence.
* Sideways from ''TransformersArmada'' is something of a double mole. First, he's pretending to be a goodie, then 'reveals' that he's a baddie, spends some time messing with the other baddies' heads, then later reveals that he's a different sort of baddie.
* In the ''{{Hellsing}}'' manga and (eventually) OVA [[spoiler: Walter C. Dorneaz betrays the Hellsing organization. This could be argued as a FaceHeelTurn but it is hinted as a long-plotted betrayal.]]
* Subverted in ''TanteiGakuenQ''. Everyone '''thinks''' [[TheStoic Tatsumi Hongou]] is the mole from Meiousei -aka the Pluto Organization- and that he arranged Morihiko Dan's kidnapping, but Tatsumi himself confronts the Q section people and calmly says he knows they don't trust him, that he's ''not'' the mole they're searching for, and that they should team up and help him find said mole. [[spoiler: It turns out that the mole is [[TeamMom Shino Katagiri]]. Or better said, a Meiousei agent impersonating her, as the real Shino had been kidnapped ''before'' Morihiko Dan himself was. She's later found alive and rescued.]]
* In ''Manga/FullmetalAlchemist'', one bad guy's identity was hidden until chapter 71, where it was revealed that [[spoiler:Selim Bradley, the cute son of the Fuhrer, was actually the biggest, meanest member of the BigBad crew as Pride, the oldest homunculus. His adorable nature pre-reveal made it amazingly shocking, and his creepy nature since (especially upon being found out by Lt Hawkeye) is quite the change]].
* The Mole in ''{{Mahoromatic}}: Something More Beautiful'' is one the cast sees coming, but it doesn't do them much good. [[spoiler: At least, she does a HeelFaceTurn when it counted.]]
* Asakura Ryoko in ''SuzumiyaHaruhi''. [[spoiler: Twice]].
* In ''{{Gravion}}'', Mizuki Tachibana, a seemingly normal (except [[{{Gainaxing}} her breasts]]) MsFanservice, turns out to be a spy for TheFederation, feeding information of the titular mecha to create their own (since they distrusted the good guys despite having the same goal of protecting Earth). She is rewarded with a life of luxury, but quickly grew miserable and bored with it, prompting her to return to the good guys.
* [[spoiler: Deep Snow]] in ''RaveMaster''.
* In ''TenchiMuyo: GXP'', The Mole is [[spoiler: Erma]]. A double reveal, in that the identity of the mole is given at the beginning of the episode, but the reason why is only at the climax. [[spoiler: Ryoko Balta is a shape-shifter. Erma was, in fact, an identity of hers.]] Since this is a Tenchi series, a Heel Face Turn and joining the harem happens quickly.
** The higher ups already knew she was a Mole, but did nothing so they could secretly get information from her.
* ''InnocentVenus''. [[spoiler: Jin]]. Turns out [[spoiler: he]] hated [[spoiler: his]] best buddy and former squadmate all along.
* [[spoiler:Runessa]] in ''AudioPlay/StrikersSoundStageX''. A [[spoiler:DragonAscendant]] who had become a much trusted member of [[TheFederation the Time-Space Administration Bureau]].
* In ''RODTheTV'' it is eventually revealed that [[spoiler: Nenene's agent Lee Linho]] actually works for Dokusensha. This was a devastatingly effective deception, as he wasn't pretending to be a good guy; he was pretending to be completely uninvolved.
* Being a series about ninja organizations, ''Manga/{{Naruto}}'' has several examples. [[spoiler: Medical ninja Kabuto]] is initially a mole in the Leaf Village for Orochimaru, and later [[spoiler: a fake mole for the Akatsuki- pretending to inform to them on the Sound Village, but really remaining loyal to Orochimaru.]] Sai was initially a mole in Squad 7 for Danzo, but he switched loyalties almost as soon as he was found out. In one of the weirdest examples, Akatsuki leader [[spoiler: Madara Uchiha]] is a mole [[spoiler: within his own organization, as the [[HarmlessVillain Harmless]] AntiVillain Tobi]].
* ''Manga/SoulEater'' had a mole murder Buttatake Joe, and they made a bit of a whodunnit out of it. It's set up to make us think that [[MadScientist Doctor Stein]] had done it, but the several GenreSavvy characters, decided to have him investigate. [[spoiler: He finds Justin Law, the youngest and most innocent-looking of the death scythes, is actually working for an AxCrazy human collector...and isn't that sane himself.]]
** There's also Crona, whose actions under Medusa's orders were the cause of BJ being in Death City in the first place.
** How far [[spoiler: Justin was pretending to be a goodie is still up for debate. Though we know his background is more questionable than originally thought, one of the first claims about him ''was'' that he was highly resistant to the insanity wavelength in comparison to other humans. From what we've seen of madness in the cast, it wouldn't take much evidence to the contrary (recklessness, unnecessary violence, questionable motives/methods) for this clean bill of health to be thrown into question. Azusa might have found out he was tricking Shibusen all along, alternatively she might have discovered reason to doubt his resistance. The fact he was sent to deliberately seek and annoy the Kishin probably didn't help, as it was presumably done under the belief that Justin was less susceptible than most to being affected by Asura.]]
** The ladies of the cabaret club also count. Both witches, both seen to be very chatty with Death Scythe when he comes into drink/flirt/mope. As a result, they found out plenty of information about his work which they passed on to Arachnaphobia, though nothing (yet) that seems to have been terribly significant. The fact they'd managed it, however, was probably bad enough.
* [[spoiler:Rob Lucci, Kaku, Kalifa and Blueno]] from ''OnePiece''. Yes, those are all from one story arc, and most are infiltrating one group.
** Princess Vivi was a Mole in the criminal organization Baroque Works, trying to figure out the identity of its leader, who was planning to take over her country.
** From the Punk Hazard arc, [[spoiler: Monet and Vice-Admiral Vergo are moles in Caesar Clown's organization and the Marines, respectively. Both work undercover for Donquixote Doflamingo, so he can keep an eye on those two organizations]].
* [[spoiler:Syaoran]] from ''TsubasaReservoirChronicle'' is more of a FaceHeelTurn than this, because of the radical personality shift. A more straight example would be [[spoiler:Fai.]]
* In ''PokemonSpecial'', it turns out that [[spoiler:Sird]] was a mole sent by [[spoiler:Team Galactic]] to infiltrate Team Rocket and learn more about space-themed Pokemon.
* In VinlandSaga Gunir is a mole. One of the characters states he doesn't trust him before Gunir even has a chance to leak information, so it's not a huge surprise when it's revealed.
* [[spoiler:Meowth]] from the ''Pokemon Best Wishes'' anime pulls this off quite well. He pretends [[spoiler:Team Rocket left him in order to let him steal their Pokemon.]] But when Pikachu finds this out, [[ThisIsUnforgivable he goes ballistic]].
* [[spoiler: Nao]] from ''Manga/BloodyCross''. He appears to be an ally and talks about how much he hates villains, but it's all an act and he's actually a mole for [[BigBad Satsuki]].
* Becomes a source of ParanoiaFuel in ''Manga/AttackOnTitan'', thanks to the revelation that [[spoiler: sentient Titans are in fact "humans in Titan flesh".]] However, the eventual discoveries that [[spoiler: Annie, Bertolt, and TeamDad Reiner are spies sent to infiltrate the human ranks]] is both shocking and a punch to the gut for the characters ''and'' the audience. Even worse, [[spoiler: Bertolt and Reiner are the Colossal Titan and the Armored Titan, respectively... and therefore responsible for a good percent of the death in the series thus far]].
* In ''Anime/LupinIIIDragonOfDoom'', Kikyo has been working for [[BigBad Chin Chin Chow]] all along.
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